2027 ICD-10-CM Diagnosis Code Z96.21Cochlear implant status

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z96

ICD-10-CM Z96.21
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z96.21 is a billable ICD-10-CM diagnosis code for cochlear implant status. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as audiological implant in situ. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z96.21
Billable Status
Yes — Valid for Submission
Code Describes
Cochlear implant status
Short Description
Cochlear implant status
Same as the full description in the CMS dataset.
Parent Code
Z96.2
Presence of otological and audiological implants

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
CategoryZ96Presence of other functional implants
This CodeZ96.21Cochlear implant status

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z96.21.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Audiological implant in situ
  • Cochlear prosthesis in situ

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z96.21: its own notes plus those printed at Z96, block Z77-Z99, and Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Z96 Presence of other functional implants applies to 40 codes
  • complications of internal prosthetic devices, implants and grafts (T82-T85)
  • fitting and adjustment of prosthetic and other devices (Z44-Z46)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status applies to 567 codes
  • any follow-up examination (Z08-Z09)

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z96.21, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Z96.21: they are not reported together with it, unless the two conditions are unrelated.

  • Z18 Retained foreign body fragments
    organ or tissue replaced by means other than transplant (Z96.-, Z97.-) names Z96.-, which includes this code

Excludes2 4

These codes carry an Excludes2 note naming Z96.21: its condition is not part of those codes, and both may be reported when the patient has both.

  • Z87.7 Personal history of (corrected) congenital malformations
    presence of other functional implants (Z96.-) names Z96.-, which includes this code
  • M96 Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
    presence of functional implants and other devices (Z96-Z97) names Z96-Z97, which includes this code
  • Z45.018 Encounter for adjustment and management of other part of cardiac pacemaker
    presence of prosthetic and other devices (Z95.1-Z95.5, Z95.811-Z97) names Z95.811-Z97, which includes this code
  • Z46 Encounter for fitting and adjustment of other devices
    presence of prosthetic and other devices (Z95-Z97) names Z95-Z97, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Cochlear Implants

A cochlear implant is a small, complex electronic device that can help to provide a sense of sound. People who are profoundly deaf or severely hard-of-hearing can get help from them. The implant consists of two parts. One part sits on the outside of the body, behind the ear. A second part is surgically placed under the skin.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z96.21 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V45.89 Post-proc states NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z96.21Overview

What is the ICD-10 code for cochlear implant status?

The ICD-10-CM code for cochlear implant status is Z96.21 (sometimes written as Z9621). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z96.21 (Presence of otological and audiological implants) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cochlear implant status on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z96.21 group to?

On inpatient claims, cochlear implant status maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

Can Z96.21 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because cochlear implant status describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of Z96.21?

Under the General Equivalence Mappings, cochlear implant status converts to ICD-9-CM V45.89 (post-proc states NEC). The mapping is approximate, so confirm the match fits the documentation.